Cretaceous Terrestrial Revolution
The Cretaceous Terrestrial Revolution (abbreviated KTR), also known as the Angiosperm Terrestrial Revolution (ATR) by authors who consider it to have lasted into the Paleogene, describes the intense floral genetic divergence, diversification of flowering plants (angiosperms) and the coevolution of entomophily, pollinating insects (especially bee, anthophilans and lepidopterans), as well as the subsequent faunal evolutionary radiation, radiation of various frugivorous, nectarivorous and insectivorous terrestrial animals then at the lower food web trophic level, levels such as mammals, avialans (early birds and close relatives), squamate reptiles (lizards and snakes) , lissamphibians (especially frogs) and spider web, web-spinning spiders, during the Cretaceous period. After the K-Pg extinction event devastated the Mesozoic terrestrial ecosystems and wiped out nearly all animals weighing more than , the survivors among these smaller animals that thrived during the KTR recovered first ...
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Paleogene
The Paleogene Period ( ; also spelled Palaeogene or Palæogene) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period Ma (million years ago) to the beginning of the Neogene Period Ma. It is the first period of the Cenozoic Era, the tenth period of the Phanerozoic and is divided into the Paleocene, Eocene, and Oligocene epochs. The earlier term Tertiary Period was used to define the time now covered by the Paleogene Period and subsequent Neogene Period; despite no longer being recognized as a formal stratigraphic term, "Tertiary" still sometimes remains in informal use. Paleogene is often abbreviated "Pg", although the United States Geological Survey uses the abbreviation "" for the Paleogene on the Survey's geologic maps. Much of the world's modern vertebrate diversity originated in a rapid surge of diversification in the early Paleogene, as survivors of the Cretaceous–Paleogene extinction event took advantage of empty ecolo ...
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